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He emphasized that Time Warner did not host or provide any of the content and was simply a portal, allowing groups to be created with content provided by the users.

"As soon as we were made aware of the issue ... we took steps to correct," Dudley said Tuesday.

The agreements follow an undercover investigation of child porn newsgroups. Cuomo said in a prepared statement that his investigation of other service providers is continuing. He has used similar investigations and the possibility of civil or criminal charges to extract concessions on Internet safety in the past.

Last year, Cuomo reached agreement with the social networking sites MySpace and Facebook to toughen protections against online sexual predators.

"By shutting down offending newsgroups and contributing to funds that will combat child pornography online, we are working to remove this content permanently," said Verizon deputy general counsel Tom Dailey.

Verizon and Time Warner Cable are two of the five largest internet service providers in the world. Verizon has 8.2 million subscribers and Time Warner Cable's Road Runner has 7.9 million. Sprint is one of the three largest wireless companies in the United States.

"We are doing our part to deter the accessibility of such harmful content through the internet and we are providing monetary resources that will go toward the identification and removal of online child pornography," said Sprint spokesman Matthew Sullivan. "We embrace this opportunity to build upon our own long-standing commitment to online child safety."